If TLS optimization is used, the Riverbed Optimization System (RiOS) providing intermediary services for TLS communications traffic must use encryption services that implement NIST FIPS-validated cryptography to protect the confidentiality of TLS.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-238500	RICX-AG-000039	SV-238500r654947_rule		Medium

Description
Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD-nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include broadband and wireless connections. Remote access methods include, for example, proxied remote encrypted traffic (e.g., TLS gateways, web content filters, and webmail proxies). Encryption provides a means to secure the remote connection so as to prevent unauthorized access to the data traversing the remote access connection, thereby providing a degree of confidentiality. The encryption strength of the mechanism is selected based on the security categorization of the information. This requirement applies to ALGs providing remote access proxy services as part of its intermediary services (e.g., OWA or TLS gateway).

Description

Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD-nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include broadband and wireless connections. Remote access methods include, for example, proxied remote encrypted traffic (e.g., TLS gateways, web content filters, and webmail proxies). Encryption provides a means to secure the remote connection so as to prevent unauthorized access to the data traversing the remote access connection, thereby providing a degree of confidentiality. The encryption strength of the mechanism is selected based on the security categorization of the information. This requirement applies to ALGs providing remote access proxy services as part of its intermediary services (e.g., OWA or TLS gateway).

STIG	Date
Riverbed SteelHead CX v8 ALG Security Technical Implementation Guide	2024-06-17

Details

Check Text ( C-41711r654945_chk )
Verify that the Riverbed Optimization System (RiOS) is configured to support TLS version 1.1 as a minimum and preferably TLS version 1.2. Navigate to the device Management Console. Navigate to Configure >> Optimization >> Advanced. Verify that "Peer Ciphers:" "Rank 1" contains the following string: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" Verify that "Client Ciphers:" "Rank 1" contains the following string: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" Verify that "Server Ciphers:" "Rank 1" contains the following string: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" If any of the above Ciphers contains strings or groups other than what is listed, this is a finding.

Check Text ( C-41711r654945_chk )

Verify that the Riverbed Optimization System (RiOS) is configured to support TLS version 1.1 as a minimum and preferably TLS version 1.2.

Navigate to the device Management Console.
Navigate to Configure >> Optimization >> Advanced.
Verify that "Peer Ciphers:" "Rank 1" contains the following string:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

Verify that "Client Ciphers:" "Rank 1" contains the following string:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

Verify that "Server Ciphers:" "Rank 1" contains the following string:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

If any of the above Ciphers contains strings or groups other than what is listed, this is a finding.

Fix Text (F-41670r654946_fix)
Configure the Riverbed Optimization System (RiOS) to support TLS version 1.1 as a minimum and preferably TLS version 1.2. Navigate to the device Management Console. Navigate to Configure >> Optimization >> Advanced Settings Select "Add a New Peer Cipher". Scroll down options list until the following is reached: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" Select that string and a "Rank" of "2". Click "Add". Select "Rank 1" "Default" Cipher String. Click "Remove Selected". Select "Add a New Client Cipher". Scroll down options list until the following is reached: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" Select that string and a "Rank" of "2". Click "Add". Select "Rank 1" "Default" Cipher String. Click "Remove Selected". Select "Add a New Server Cipher". Scroll down options list until the following is reached: "TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL" Select that string and a "Rank" of "2". Click "Add". Select "Rank 1" "Default" Cipher String. Click "Remove Selected". Navigate to the top of the web page and click "Save" to save these settings permanently.

Fix Text (F-41670r654946_fix)

Configure the Riverbed Optimization System (RiOS) to support TLS version 1.1 as a minimum and preferably TLS version 1.2.

Navigate to the device Management Console.
Navigate to Configure >> Optimization >> Advanced Settings
Select "Add a New Peer Cipher".
Scroll down options list until the following is reached:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

Select that string and a "Rank" of "2".
Click "Add".
Select "Rank 1" "Default" Cipher String.
Click "Remove Selected".
Select "Add a New Client Cipher".
Scroll down options list until the following is reached:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

Select that string and a "Rank" of "2".
Click "Add".
Select "Rank 1" "Default" Cipher String.
Click "Remove Selected".
Select "Add a New Server Cipher".
Scroll down options list until the following is reached:

"TLSv1.2+FIPS:kRSA+FIPS:!eNULL:!aNULL"

Select that string and a "Rank" of "2".
Click "Add".
Select "Rank 1" "Default" Cipher String.
Click "Remove Selected".

Navigate to the top of the web page and click "Save" to save these settings permanently.